Means jjor testing staybolts por boilers



MEANS FOR TESTING STAYBOLTS FOR BOILERS.

APPLICATION FILED FEB. 8,19IB.

Patented Nov. 25, 1919.

WITNESSES tartan sra'ras rarest ensues.

ETHAN I. nonns, or PITTSBURGH, PENNSYLVANIA, ASSIGNGR To FLANNERY BoLTCOMPANY, or PITTSBURGH, PENNSYLVANIA.

MEANS FOR TESTING STAYBOLTS FOR BOILERS.

Specification of Letters Patent.

Patented Nov. 25, 1919.

Application filed February 8, 1918; Serial No. 216,018.

To all whom it may concern:

Be it known that I, ETHAN I. DoDDs, a citizen of the United States, anda resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements in Meansfor Testing Staybolts for Boilers; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in means for testing stayboltsfor boilers,--one object of the invention being to provide simple andeilicient means which may be applied to staybolts while the same are inplace in the steam boiler structure, for determining the integrity ofthe same.

- A further object is to provide testing means which may be employed fordetermining whether the tell-tale hole of a staybolt contains moistureand thereby ascertaining whether the bolt is whole or-fractured.

With these and other objects in View, the invention consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view; Fig. 2 is arear end view of the testing device; Fig. 3 is a front end view; Fig. 4is a view in side elevation, and Fig. 5 is a diagrammatical view showingthe testing device connected with an exhaust pump and a stay bolt.

1, 2 represent the outer and inner sheets which may form a water leg ofa steam boiler structure, said sheets being connected by flexible stavbolts, as is well understood. In the present instance, I haveillustrated a stay bolt 3 which is threaded through the inner boilersheet 2 and upset and at its outer end, a rounded head 4 is provided,said head having a bearing in a sleeve 5 threaded through the outerboiler sheet, and a cap 6 on said sleeve incloses the headed end of thebolt. The bolt 3 is also made with a tell-tale bore 7 which isaccessible at its inner end for the application of my improved testingdevice and said tell-tale bore may be made to extend to and terminatewithin the headed end of thebolt.

My improved testing device comprises ashell or casing 8, to the outerperipheral edge of which a packing ring 9 of rubber or other suitablematerial isv secured, whereby the device may be caused to fit air-tightagainst the face of the inner boiler sheet 2, as shown in Fig. 1. Anannular head 10 is secured to therear end of the casing 8 and made witha tubular extension 11 forming a nipple for the attachment ofa suitablevacuum pumpor a pipe leading to such pump,said tubular extension beingcaused to communicate with the chamber 12 formed by the shell or casing8, throu h a port 13 in therear end of the latter.

The shell 8 is provided therein with a housing 14 (which may be castintegral therewith) for the accommodation of a nozzle 15,*the latterbeing made somewhat tapering at its free end to enter and closely fitthe tapering inner end of the tell-tale bore 7 of the bolt. A spring 16located within the housing 14 serves to press the free end'of the nozzlesnugly into the tell-tale bore,said spring bearing at one end againstthe nozzle and at the other end against a nut 17 screwed'into the rearend of said housing. The nut 17 is made with a port 18 whereby the tubeor nipple, 11 may communicate, through the housing 14, with the nozzle15'and with the tell-tale bore of the bolt. The shell 8 is also providedtherein with a passage 19 (the wall of which may be made integral withthe shell 8 and housing 14) which communicates with the housing 14, andthis passage receives a short pipe 20 which depends from the shell andcarries an indicator cup 21 of glass or other transparent material.

In the operation of my improved testing means, the same is first appliedto a bolt and boiler sheet as clearly shown in Fig. 1. The pump willthen be operated in a manner to exhaust the air from the chamber 12 andthe tell-tale bore of the bolt. The exhausting of the air from thechamber 12 of the shell will cause the latter to tightly hug (bysuction) the boiler sheet 2 and the air will be exhausted from thetell-tale bore, through the nozzle. 15, housing 14 and port 18. If thebolt is fractured so that moisture in the form of water or condensedsteam has entered the tell tale bore, the water will be withdrawn withthe air by the action of the exhaust pump, and this water will passthrough the nozzle 15 and gravitate from iio the housing 14 through thepassage 19 and pipe 20 to the indicator cup 21. ,Thus it Will be seenthat when the device'is operated as above described, thepresence-ofWater in the cup 21 Will at once indicate the fact that the bolt isfractured. On the other hand, if no Water appearsin the cup 21, thisfact will denote that the bolt is Whole. "Thusthe integrity of the boltmay be quickly, easily and accurately determined.

Various slight changes might be made inv the open end of the bolt andhavingtineans for connection -Wltl1 suction means .and means carried bysaid device, ,and located out of the path of movementof the airWithdrawn from the boreof the stay bolt for collecting-any aterthatamayz be drawn from the said tell tale bore. 7 I

p '2. A st: ybolt testing device comprisinga portable suction deviceadapteduto be applied to the end of the-bolt, a nozz'lewithin saiddeviceadapted to comnnuiicate with the tell-tale hole in: the bolt, =andmeans-also carried by said device 'for-collectingany Water that maybedrawn outof the telltale bore.

3. A staybolt testing device, com-prisinga nozzle to communicate Withthe ;te1l-tale bore of .a stay bolt, .means iorv connecting airexhausting means with said mozzle,

Water which may escape-through said nozzle from the tell tale bore.

exhausting air from the chamber Within said shell and through saidnozzle, means for segregating Water which may escape with the airfromithetellqtale bore, and indicating means for collecting suchsegregated Water. I

5. A stayboltt-testing devicecomprising a shell open atone ,end, packing.material on the peripheral edged the ,opengend \of said shell, means.for connecting {the chamber Within said. shell with air: exhausting,means, a nozzle carried by. said shell for connection with the.tell-tale bore, of a stay,;bolt, neans for connecting said nozzle .wviththe air eX- hausting means, an indicator ,contaiiner communicating ,Withsaid nozzle to receive 6. Astayv bolt testing-device, comprising a shellhaving ,an .open endfor application to a boiler sheet, a housingavithinsaidshell, a springpressed nozzle carried, by said shell forapplication to the tell-tale bore of a stay bolt, a transparent cupdisposed lnder ,and communicating with said .housing, and neans co-inecting said housing with ,air sexhausting means. v i

In testimony whereof, I have signedithi's specification in the vpresenceof gtnzo subscribing Witnesses.

ETHANI. DQDDS, Vitnesses: v I

. F. H. ALLisoN,

JOHN M. BoNEY. s .57

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